Governor



y Patented Apr. 23,1946

GOVERNOR Stanley M. Udale. Detroit, Mich.. assigner to V George M. Holley and Earl Holley Application October 15, 1945, Serial No. 622,452 1 Claim. (Cl. 123-103) The object of this invention is 'to govern in two stages:

1st stage-normal wide-open operation to act at say 2000 revolutions per minute at full load;

2ndstage-to automatically reduce speed at light load to say 5.000 revolutions per minute.

Figure 1 shows the preferred form of my invention.

Figure 2 shows an alternative modification.

In Figure 1, I is the air entrance, Il is a fuel nozzle discharging into the throat of a venturi I2 of a carburetor, the float chamber of which is not shown. A throttle I4 controls the mixture outlet and a lever I6 connected to a rod I8. automatically controls the throttle I4. A manual control Il is available for pushing the throttle into its closed position, a spring I9 pushes the throttle open, a diaphragm 60 is engaged by the y spring I9 and engages with the rod I6, a chamber 20 located to the right of diaphragm 80 is connected through restriction 'I2 with the inlet manifold 34 through a pipe 22. This pipe 22 and a pipe 25 connected thereto connect the chamber 20 with a passage 26 in a rotating element 68, driven by the shaft 'I0 at engine speed or some fraction of engine speed. A weight 28 responds to centrifugal force and controls an opening 30 by lmeans of a needle 32. The passage 26 communicates with the opening 30 through drilled passages in the weight 28. A rod 52 is connected to vthe we ight 28 and to a tension spring 44 anchored to a second diaphragm 42. A compression spring t6 pushes the diaphragm to the left against a spring stop 50.

A second passage 38 connects the inlet manifold 33 through a passage 36 with a chamber 00.

Description-Figure 2 In Figure 2, the centrifugal weight lt is pushed off its seat by a spring 13. As before, needle 32 controls an atmospheric opening 3; as before, the passage 26 communicates with the atmospheric opening 30 through drilled passages in the Weight 14. The rod t is hooked over a lever 55. Lever 56 is pivoted at link 62 and is anchored from below and is supported by a tension spring phragm engages with the stop 46, which is located on the upper end of a spring 8 I Operation-Figure 1 Assume that the rod Il is pushed over to the left so as to permit the throttle I4 to respond to the diaphragm 80, to the spring I9 and to the governor. Then, first the throttle I4 opens as atmospheric pressure acts through 30, past needle 32, through the weight 28, down the passage 26, across the pipe 24 to the chamber 20. Hence, the spring I8 pushes the rod I8 to the left and opens the throttle I4 when there is a low suction in manifold 34, that is, when there is aheavy load on the engine. v

.At high speed, the weight 28 illes over to the right, closes the opening 38, and the diaphragm responds to the depression in the manifold 36,-

as the throttle I4 closes,

which rapidly increases so much so that the suction in chamber 40 moves diaphragm 42 to the left, reducing the tension in the spring 44. Hence, at idle, a. low speed is reached before the weight 28 is lifted off the seat 30, and this low speed, at which the weakened spring 4t moves the weight 28 to the left, is the low speed at which the engine idles. When load is applied, the suction in 34 is reduced and highspeed governing is restored. This governor can thus be set for a governed speed under full load of say 2000 revolutions per minute and at 1000 revolutions per minute, the engine would idle at no load.

Operation/*Figure 2 When the critical speed is reached at full load, the weight 74 compresses the spring 13, stretches the spring 5l and closes the opening 30. When the high suction, corresponding to no load, acts on the diaphragm 60, it moves to the right and the upper end of lever 58 also moves to the right; hence, only the spring 'I3 remains in action to keep the weight 14 from moving the needle 32 to the right to close the opening 30. Hence, at a low speed, say 1000 revolutions per minute, the weight 74 closes the opening 30 and the no-load governed speed is 1000 revolutions per minute as compared with full-load governed speed of A2000 revolutions per minute.

'I'he weight 'i4 can be of brass and the center portion of diaphragm 60 can be aluminum or of magnesium, as can the lever 58, link 62 and rocl 56, so that the centrifugal effect on the diaphragm link and lever may be small as compared with the centrifugal eilect ofthe weight lil What I claim is:

In a centrifugal governor for an internal oombustion Lengine having a throttle and a spring adapted to open said throttle, manual means for closing said throttle, automatic means for closing said throttle responsive to the suction in the air entrance to said engine, an atmospheric air vent admitting air to said suction responsive means whereby said suction responsive imeans are rendered inoperative to close the throttle, cen- 10 aseaoeo tritugally operated means for closing said atmospheric air vent, spring means for opposing the centrifugal force, second suction responsive means also responsive to the suction on the engine side oi' said throttle for weakening the eiect oi' said spring means so as to change the governed speed whereby there are two governed speeds, one for high suction and one for low suction on the engine side of said throttle.

, STANLEY M. UDALE. 

